Ответ:

Решение:

  1. \(3x + 18 = 5x - 4\)
    \(18 + 4 = 5x - 3x\)
    \(22 = 2x\)
    \(x = \frac{22}{2}\)
    \(x = 11\)
  2. \(6x - 2(2x + 8) + 1 = -6x + 9\)
    \(6x - 4x - 16 + 1 = -6x + 9\)
    \(2x - 15 = -6x + 9\)
    \(2x + 6x = 9 + 15\)
    \(8x = 24\)
    \(x = \frac{24}{8}\)
    \(x = 3\)
  3. \(\frac{6x - 6}{5} = \frac{3x + 4}{10}\)
    Умножим обе части на 10:
    \(10 \cdot \frac{6x - 6}{5} = 10 \cdot \frac{3x + 4}{10}\)
    \(2(6x - 6) = 3x + 4\)
    \(12x - 12 = 3x + 4\)
    \(12x - 3x = 4 + 12\)
    \(9x = 16\)
    \(x = \frac{16}{9}\)

Ответ: 1) 11; 2) 3; 3) \(\frac{16}{9}\).